\begin{tikzpicture}[scale=0.5]
\pgfplotsset{every axis grid/.style={style=dotted}}
\begin{axis}[%
name=main plot,%
axis on top,%
width=150mm,%
height=118.306mm,%
scale only axis,%
xtick={0,100,200,300,400,500},%
ytick={0,50,100,150,200,250,300,350,400,450},%
xmin=-88.0011, xmax=549.749,%
ymin=-10, ymax=493%
]
